linux-kernel - Re: [PATCH 2/3] dt-bindings: mtd: atmel-nand: add atmel pmecc

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Date: Wed, 20 Mar 2024 16:40:10 +0000
From: Conor Dooley <conor@...nel.org>
To: Balamanikandan Gunasundar <balamanikandan.gunasundar@...rochip.com>
Cc: Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Vignesh Raghavendra <vigneshr@...com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Nicolas Ferre <nicolas.ferre@...rochip.com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Claudiu Beznea <claudiu.beznea@...on.dev>,
	linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: mtd: atmel-nand: add atmel pmecc

On Wed, Mar 20, 2024 at 11:22:08AM +0530, Balamanikandan Gunasundar wrote:
> Add bindings for programmable multibit error correction code controller
> (PMECC).
> 
> Signed-off-by: Balamanikandan Gunasundar <balamanikandan.gunasundar@...rochip.com>
> diff --git a/Documentation/devicetree/bindings/mtd/atmel-pmecc.yaml b/Documentation/devicetree/bindings/mtd/atmel-pmecc.yaml

Filename matching a compatible please.

> new file mode 100644
> index 000000000000..872401e9dda3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/atmel-pmecc.yaml
> @@ -0,0 +1,58 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mtd/atmel-pmecc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip pmecc controller
> +
> +maintainers:
> +  - Balamanikandan Gunasundar <balamanikandan.gunasundar@...rochip.com>
> +
> +description: |
> +  Bindings for microchip Programmable Multibit Error Correction Code
> +  Controller (PMECC). pmecc is a programmable BCH encoder/decoder. This
> +  block is passed as the value to the "ecc-engine" property of microchip
> +  nand flash controller node.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - enum:
> +          - atmel,at91sam9g45-pmecc
> +          - atmel,sama5d2-pmecc
> +          - atmel,sama5d4-pmecc
> +          - microchip,sam9x60-pmecc
> +          - microchip,sam9x7-pmecc
> +      - items:
> +          - const: microchip,sam9x60-pmecc
> +          - const: atmel,at91sam9g45-pmecc
> +
> +  reg:
> +    description:
> +      The first should point to the PMECC block. The second should point to the
> +      PMECC_ERRLOC block.

Constraints please. In fact, describe it as an items list and then you
don't need constraints or a free-form text explanation of what each
entry is :)

> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: microchip,sam9x7-pmecc
> +    then:
> +      properties:
> +        clocks:
> +          description:
> +            The clock source for pmecc controller
> +          maxItems: 1

Please define the property at the top level and constrain it on a per
device basis.

> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    pmecc: ecc-engine@...fc070 {

Drop the unused label please.

Thanks,
Conor.

> +            compatible = "microchip,sam9x7-pmecc";
> +            reg = <0xffffe000 0x300>,
> +                  <0xffffe600 0x100>;
> +            clocks = <&pmc 2 48>;
> +    };
> 
> -- 
> 2.25.1
> 

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